cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 89

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table 1-21. Register Values for 640x480 / 800x600 / 1024x768 RGB In, SECAM-L Out (4 of 4)
Table 1-22. Vital SECAM Bit Settings–Register 0xA2
100381B
NOTE(S):
1. Register 0x6C contains the TIMING_RESET bit. Set this bit as your last programming step and the CX25870 will clear it
2. Register 0xC4 contains the EN_OUT bit. Adjust according to your design's interface as necessary.
3. Register 0xC6 contains the EN_BLANKO, EN_DOT, and IN_MODE[2:0] bits. Adjust according to your design's interface as
4. Register 0xCE contains the OUT_MUXD[1:0], OUTMUXC[1:0], OUTMUXB[1:0], and OUTMUXA[1:0] bit fields for output
5. This is a SECAM specific register.
FM
PAL_MD
VSYNC_DUR
automatically later.
necessary.
routing. Adjust according to your design's interface as necessary.
Register Address
Bit Name
0xCE
0xCA
0xCC
0xD0
0xD2
0xD4
0xD6
0xD8
(4)
compensation percentage that differs from those solutions in
simple. First, configure the encoder so it generates a standard PAL-B output with
the desired overscan compensation percentage. This can be done through the use
of an autoconfiguration mode, a hand-generated, or a predefined register set.
Second, perform a full register read-back from the CX25870. Carefully note the
value for register 0xA2. Third, program only the bits found in
new state within the CX25870.
Bit 7 of register 0xA2
Bit 5 of register 0xA2
Bit 3 of register 0xA2
CX25870 Register
The procedure required to obtain a SECAM output with an overscan
640x480 RGB in,
HOC = 16.55%,
VOC = 16.66%
SECAM-L out
Values
C0
C0
24
00
00
00
00
40
Location
Conexant
800x600 RGB in, SECAM-L
CX25870 Register Values
out HOC = 14.52%
VOC=13.19%
0
1
0
State for PAL-BDGHI
C0
C0
24
40
0
0
0
0
CX25870 Register Values
1.0 Functional Description
1
0
0
1024x768 RGB in,
HOC = 12.72%
VOC = 12.15%
SECAM-L out
Table 1-21
State for SECAM
1.3 Device Description
Table 1-22
C0
C0
24
40
0
0
0
0
is fairly
to their
1-73